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background extinctionHintergrundaussterben (ger.)

  • The normal rate of extinction of species, which reflects changes in local environmental conditions, in the absence of human influences. (Oxford Dict. of Environment and Conservation 2007)

    the Permo-Triassic and Cretaceous-Tertiary intervals can be interpreted to be short periods of marked increase in the background extinction rate.

    Raup, D.M. (1978). Cohort analysis of generic survivorship. Paelobiol. 4, 1-15: 8.


    the total rate of background extinction has decreased from about 4.6 to 2.0 fm [families] per million years since the Early Cambrian.

    Raup, D.M. & Sepkoski, J.J. Jr. (1982). Mass extinction in the marine fossil record. Science 215, 1501-1503: 1502.